Shouldn't militaries simply have their own Grids?
The way I see it, a Military Grid would technically be a Local Grid - unless you're within range of the infrastructure that provides the connectivity, you can't access the grid. The caveat is that the military doesn't only use fixed infrastructure - they also use
mobile infrastructure.
Naturally the military is going to have a portion of their grid which is static to provide access from permanent positions such as military bases, regimental headquarters, the Pentagon, et cetera. But they're also going to want to be able to set up mobile command centers, forward communications bases, relay outposts, and that sort of thing. Additionally, they'll certainly have communications vehicles, like some updated form of
AWACS soaring in the lofty upper limits of the atmosphere, acting as airborne "cell towers" for Military Grid access.
So we've got Grunt Greg on a mission to blow up a supply depot. All his personal electronics like his smartgun system and his helmet's vision enhancements and image recorder are controlled by his commlink's PAN; and his commlink connects wirelessly to the Military Grid. He's deep in enemy territory, which means his only access to the Military Grid is through the cutting edge stealth AWACS circling somewhere overhead, temporarily making the region into part of the Local Military Grid. His squad or platoon will probably also have their own remote Spider or two assigned to them, monitoring their communications for the duration of the mission.
Now, if the Military runs their own Grid, then surely they have their own demiGOD dedicated to policing that Grid. However, I suspect that Military Grids are actually unaffiliated with GOD proper - after all, they're not part of the Corporate Council or subject to its wishes, nor are they using corporate infrastructure.
Since the point of a military grid is to provide communications to the military in question while preventing non-authorized personnel from gaining access, I imagine a Military Grid has much less forgiving protocols than ordinary Corporate Grids intended for everyday consumer Matrix connectivity. This would translate to either an increased gain rate for Overwatch Score, or a lower threshold for Convergance, or possibly both.
So let's start connecting the dots, pluggin in numbers, and seeing how this concept works.
Grunt Greg and the rest of his squad reach their destination and engage the enemy forces at the supply depot. The enemy returns fire, but also starts trying to cut off their communications. Naturally they have a few options for doing this.
1) The enemy can directly hack the individual commlinks and other devices that Grunt Greg and his squad are each carrying.
2) The enemy can instead hack the circling AWACS - assuming they can manage to detect it, as well as manage the difficult hack.
3) The enemy can deploy Jammers (hopefully Military Grade with very high Ratings) against Greg's squad, drowning them in Noise.
4) The enemy can shoot down the AWACS - again assuming they can manage to detect it, as well as hit it with something.
Since Grunt Greg and his allies are on their military's own private Grid, any hack attemps made against them from a different Grid suffer the standard -2 dice. (In fact, since Military Grids probably are independent from GOD and probably have their own custom Overwatch Score settings, they also probably have their own more restrictive custom penalties for unauthorized access. Maybe -4 dice? Maybe -6?)
The enemy hacker doesn't like the sound of operating at a hefty penalty, so they instead decide to Hack on the Fly in order to change Grids, gaining illegitimate access to Greg's Military Grid. A normal Local Grid defends against such an act with 4 dice, but this isn't a "normal" Grid: it's Milspec, and that means just like the beefed up Overwatch Score accumulation, reduced Convergence threshold, and increased off-grid penalty, getting Hack on the Fly access is harder too. Maybe the Military Grid rolls 6 dice to defend itself. Maybe it rolls 8. Who knows.
Whatever the case, the enemy hacker gets lucky and manages to fake access and hop onto the Military Grid. The cost is high, however, as they were going up against an increased defense pool which scored more hits than your average Grid would. On a normal Grid, your OS increases by 1 for every hit a target gets on their defense tests. On a Military Grid, maybe your OS increases by 2 for every hit, or even 3 or 4.
So in this case, with the Military Grid rolling 8 dice and getting a pretty average roll of 3 hits, that gets multiplied by.. hrm... let's say 3... and the enemy hacker is already at an OS of 9, just for changing grids. Of course, now that they have access to the Military Grid, they can avoid dealing with that pesky off-grid penalty to their actions, so it might be worth it.
The enemy hacker decides to go for the (comparatively) simple route and attempts to hack Grunt Greg's PAN via his commlink, hoping to gain access and wreak havoc with his gear. Greg's busy shooting his gun, and his squad's remote Spiders are busy handling an attempted intrusion from one of the enemy team's other hackers, so Greg's commlink will have to fend for itself. The enemy hacker decides to try for two Marks and rolls to Hack on the Fly.
The Milspec Firewall on Greg's commlink puts up a valiant fight, but the enemy hacker manages to get through - although not before Greg's Firewall gets 4 hits, raising their OS by another 12 points. The enemy hacker is now up to a total OS of 21, over halfway to Convergence - they'll have to work quickly before the Military Grid's demiGOD brings the hammer down!
Of course, maybe Military Grid's have a lower Convergence threshold. Maybe instead of 40 points, you only have to rack up 30. Although, with Milspec devices and programs typically being higher Rating than others, that already means they'll typically score more hits on defense rolls, which means a Hacker's OS will already be rising more quickly than normal. Having a multiplier on OS accumulation might be too harsh, especially if you also combine that with a reduced Convergence threshold. Naturally the numbers would need to be looked at in detail, but you could tweak it in various ways to strike a proper balance.
Overall, I don't really see the problem with Militaries using the extant system, so long as they operate their own Grids independent of GOD and have better gear and more punishing restrictions than than is normal for Matrix work.
~Umi